All buildings must be a safe distance away from overhead lines. 

The minimum distance between a building and an overhead line varies depending on the voltage the line is carrying. 

Your building needs to be clear of lines both underneath and to the side. 

Minimum distances between buildings and power lines

Minimum distance between power lines

Voltage Minimum distance beneath power lines Minimum distance to side of power poles and lines
Not exceeding 1kv 4m 3.5m
Exceeding 1kv but not exceeding 11kv 5.5m 5m
Exceeding 11kv but not exceeding 33kv 7m 8.5m
Exceeding 33kv but not exceeding 110kv 7.5m 9.5m
Exceeding 110kv Refer to table 2 NZECP 34